Hex #303f4b or rgb(48,63,75) in RGB space is the tint of blue. It has hue angle of 206.67 degrees, value = 29 and saturation = 36. #303f4b can be obtained by mixing 4 colors: 3 drops of magenta, 4 drops of blue, 4 drops of green, 5 drops of black.
Nearest safe hex - #333333. Below you can see the block with #303f4b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #303f4b to the mixer and play with it.